ci: Bypass safe-chain proxy on pnpm publish (#38700)

.github/workflows/release-publish.yml

@@ -68,8 +68,8 @@ jobs:
 
       - name: Dry-run publishing
         run: |
-          pnpm --filter n8n publish --no-git-checks --dry-run
-          pnpm publish -r --filter '!n8n' --no-git-checks --dry-run
+          "$PNPM_HOME/pnpm" --filter n8n publish --no-git-checks --dry-run
+          "$PNPM_HOME/pnpm" publish -r --filter '!n8n' --no-git-checks --dry-run
 
       - name: Pre publishing changes
         run: |
@@ -90,13 +90,14 @@ jobs:
           if [[ "$PUBLISH_TAG" =~ ^v?[0-9] ]]; then
             PUBLISH_TAG="release-${PUBLISH_TAG}"
           fi
-          pnpm publish -r --filter '!n8n' --publish-branch "$PUBLISH_BRANCH" --access public --tag "$PUBLISH_TAG" --no-git-checks
+          "$PNPM_HOME/pnpm" publish -r --filter '!n8n' --publish-branch "$PUBLISH_BRANCH" --access public --tag "$PUBLISH_TAG" --no-git-checks
 
       # If we don't use the --tag rc, all releases will default to "latest".
       - name: Publish n8n to NPM with rc tag
         env:
           PUBLISH_BRANCH: ${{ github.event.pull_request.base.ref }}
-        run: pnpm --filter n8n publish --publish-branch "$PUBLISH_BRANCH" --access public --tag rc --no-git-checks
+        run: |
+          "$PNPM_HOME/pnpm" --filter n8n publish --publish-branch "$PUBLISH_BRANCH" --access public --tag rc --no-git-checks
 
       - name: Cleanup rc tag
         run: npm dist-tag rm n8n rc

.github/workflows/util-probe-npm-oidc-exchange.yml

@@ -13,14 +13,68 @@ permissions: {}
 
 jobs:
   probe:
-    name: Probe npm OIDC exchange
+    name: Probe npm OIDC exchange (${{ matrix.name }})
     runs-on: ubuntu-latest
     environment: npm
     permissions:
       id-token: write
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: pnpm 12
+            safe_chain: false
+            bypass_safe_chain: false
+          - name: pnpm 12 with SafeChain
+            safe_chain: true
+            bypass_safe_chain: false
+          - name: pnpm 12 with SafeChain bypass
+            safe_chain: true
+            bypass_safe_chain: true
     env:
       PACKAGE_NAME: ${{ inputs.package-name }}
     steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Set up Node.js
+        if: matrix.safe_chain == false
+        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
+        with:
+          node-version: '26.5.1'
+
+      - name: Resolve pnpm version
+        id: pnpm-version
+        if: matrix.safe_chain == false
+        run: node .github/scripts/resolve-pnpm-version.mjs
+
+      - name: Set up raw pnpm
+        if: matrix.safe_chain == false
+        uses: pnpm/setup@703c52620218391530e48b9e8870d5c0082e1b9b # v2.1.0
+        with:
+          install: false
+          version: ${{ steps.pnpm-version.outputs.version }}
+
+      - name: Install dependencies without SafeChain
+        if: matrix.safe_chain == false
+        run: pnpm install --frozen-lockfile
+
+      - name: Set up pnpm with SafeChain
+        if: matrix.safe_chain == true
+        uses: ./.github/actions/setup-nodejs
+        with:
+          build-command: ''
+
+      - name: Verify pnpm version for publishing
+        shell: bash
+        run: |
+          if [ "$(pnpm --version)" != '12.3.4' ]; then
+            echo '::error::Expected pnpm 12.3.4 for publishing.'
+            exit 1
+          fi
+
       - name: Exchange GitHub OIDC token with npm
         shell: bash
         run: |
@@ -59,3 +113,28 @@ jobs:
           fi
 
           echo 'npm OIDC token exchange succeeded.'
+
+      - name: Dry-run an unpublished package version with pnpm
+        shell: bash
+        run: |
+          set -euo pipefail
+          PROBE_DIRECTORY="$RUNNER_TEMP/npm-oidc-probe"
+          mkdir "$PROBE_DIRECTORY"
+          node --input-type=module -e '
+            import { writeFileSync } from "node:fs";
+            const [path, name, runId, attempt] = process.argv.slice(1);
+            writeFileSync(path, JSON.stringify({
+              name,
+              version: "0.0.0-oidc-probe." + runId + "." + attempt,
+            }));
+          ' "$PROBE_DIRECTORY/package.json" "$PACKAGE_NAME" "$GITHUB_RUN_ID" "$GITHUB_RUN_ATTEMPT"
+
+          pnpm_command=(pnpm)
+          if [ '${{ matrix.bypass_safe_chain }}' = 'true' ]; then
+            pnpm_command=("$PNPM_HOME/pnpm")
+          fi
+          "${pnpm_command[@]}" --dir "$PROBE_DIRECTORY" publish --access public --no-git-checks --dry-run 2>&1 | tee "$RUNNER_TEMP/pnpm-oidc.log"
+          if [[ "$(< "$RUNNER_TEMP/pnpm-oidc.log")" == *'Skipped OIDC: ERR_PNPM_AUTH_TOKEN_FETCH'* ]]; then
+            echo '::error::pnpm failed to exchange the OIDC token.'
+            exit 1
+          fi